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<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
       var getMax = function(){/* 先声明变量，再储存函数 */
            var max = 0;/* 局部变量 */
            for(var i = 0;i<arguments.length;i++){
                if(max<=arguments[i]) {
                    max = arguments[i];
                }
            }
            return max;
        }
        console.log(getMax(1,6,9,18))
 //       console.log(max);
    </script>
</body>
</html>